1. Department
of Medicinal Chemistry and Pharmacognosy, Drug Discovery Program, University of Illinois at Chicago, Chicago, Illinois 60612, United States
2. Division
of Genetics and Development, Krembil Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada
3. Laboratory
of Structural Biology, Institute of Biotechnology, Czech Academy of Science, Vestec 252 50, Czech Republic